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Compound corrosion inhibitor suitable for corrosive medium in gas phase region of storage tank and preparation method of compound corrosion inhibitor

A technology of corrosive medium and corrosion inhibitor, which is applied in the field of compound corrosion inhibitor and its preparation, can solve the corrosion phenomenon of unsuitable carbon steel in neutral and acidic medium, the large volume of the gas phase area inside the storage tank, and unsuitable reasons Oil tank protection and other issues, to achieve the effect of excellent atomization performance, good corrosion inhibition effect, and low production cost

Pending Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN201010608485.4 provides a compound corrosion inhibitor suitable for corrosive media and its preparation method. The compound corrosion inhibitor consists of maleic anhydride octylamine corrosion inhibitor, oleic acid amide corrosion inhibitor, molybdic acid Composed of sodium corrosion inhibitor and BTA corrosion inhibitor, its mass fraction is: maleic anhydride octylamine corrosion inhibitor 10%-75%, oleic acid amide corrosion inhibitor 10%-75%, sodium molybdate corrosion inhibitor 10%- 75%, BTA corrosion inhibitor 5%-50%; the invention proposes a compound corrosion inhibitor suitable for corrosive media, especially for neutral and alkaline corrosive media, the compound corrosion inhibitor can simultaneously Effectively inhibit the corrosion of carbon steel and copper alloys in neutral and alkaline media; but this patented technology is not suitable for inhibiting the corrosion of carbon steel in neutral and acidic media, so it is not suitable for the protection of crude oil tanks
In the gas phase area of ​​crude oil storage tanks, the application of the traditional corrosion inhibitor filling process in the gas phase space is limited
Although the gas-phase corrosion inhibitor has a certain volatility, due to the large volume of the gas-phase region inside the tank, if only relying on the volatility of the corrosion inhibitor itself cannot meet the protection of the entire tank top, it is necessary to develop new technologies And implement new protective measures to achieve effective protection of the gas phase area inside the tank

Method used

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preparation example Construction

[0028] A preparation method of a composite corrosion inhibitor suitable for the corrosive medium in the gas phase zone of the storage tank proposed by the present invention comprises the following steps:

[0029] Step 1: the synthesis of aminoacetic acid corrosion inhibitor;

[0030] In the reactor, add urotropine, add ammonia water with a mass fraction of 20-30%, stir and control the temperature to 20-30°C, the amount of ammonia water added is 1-1.2mL per gram of urotropine; After making it fully dissolved, dropwise add mass fraction 20-25% chloroacetic acid solution, and dropwise add mass fraction 25-30% ammonia water simultaneously, the weight ratio of described urotropine, chloroacetic acid solution and ammonia water is 1:5- 7:8-12; the reaction temperature is controlled at 50-60 °C, pH=7-8, and kept at 72-78 °C for 2-3 h; cooled to below 45 °C, the reactant is mixed with 90-100% ethanol , Carry out alcohol analysis, let it stand for 8-12h, filter the crude product, then ...

Embodiment 1

[0037] A preparation method of a composite corrosion inhibitor suitable for the corrosive medium in the gas phase zone of the storage tank proposed by the present invention comprises the following steps:

[0038] Step 1: the synthesis of aminoacetic acid corrosion inhibitor;

[0039] In a 500 mL four-neck flask equipped with an electric stirrer, a reflux condenser, a thermometer, and a dropping funnel, add 21 g of urotropine and 22 mL of 23% ammonia water, stir and control the temperature to 26°C; make it fully After dissolving, add chloroacetic acid solution (composed of 100g chloroacetic acid and 33 mL water) dropwise, and at the same time add about 200 g of ammonia water with a mass fraction of 28%. The reaction temperature is controlled at 50-60°C, pH=7-8, and kept at 72-78°C for 2-3 hours; cooled to below 45°C, pour the reactant into a beaker with 1000mL of 95% ethanol, and carry out Alcohol analysis, let stand for 10 h, filter the crude product, then refine it with 75% ...

Embodiment 2

[0047] A preparation method of a composite corrosion inhibitor suitable for the corrosive medium in the gas phase zone of the storage tank proposed by the present invention comprises the following steps:

[0048] Step 1: the synthesis of aminoacetic acid corrosion inhibitor;

[0049] In a 500 mL four-neck flask equipped with an electric stirrer, a reflux condenser, a thermometer, and a dropping funnel, add 21 g of urotropine and 22 mL of 23% ammonia water, stir and control the temperature to 26°C; make it fully After dissolving, add chloroacetic acid solution (composed of 100g chloroacetic acid and 33 mL water) dropwise, and at the same time add about 200 g of ammonia water with a mass fraction of 28%. The reaction temperature is controlled at 50-60°C, pH=7-8, and kept at 72-78°C for 2-3 hours; cooled to below 45°C, pour the reactant into a beaker with 1000mL of 95% ethanol, and carry out Alcohol analysis, let stand for 10 h, filter the crude product, then refine it with 75% ...

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PUM

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Abstract

The invention discloses a compound corrosion inhibitor suitable for a corrosive medium in a gas phase region of a storage tank and a preparation method of the compound corrosion inhibitor, and relates to the field of corrosion and protection of the storage tank, the compound corrosion inhibitor is composed of glycine, dicyclohexylamine nitrite, carboxylate and glucose, the mass fraction of the amino acetic acid is 10%-75%, the mass fraction of the dicyclohexylamine nitrite is 10%-55%, the mass fraction of the carboxylate is 2%-6%, and the mass fraction of the glucose is 5%-10%; the compound corrosion inhibitor is especially suitable for a neutral or acidic corrosive medium, and can effectively inhibit the corrosion phenomenon of carbon steel in the neutral or acidic medium; according to the compound corrosion inhibitor, through a corrosion inhibitor compounding and synergistic method, the synergistic effect of all the components is fully exerted, and then a good corrosion inhibition effect is achieved.

Description

technical field [0001] The invention relates to the technical field of storage tank corrosion and protection, in particular to a composite corrosion inhibitor suitable for corrosive media in the gas phase region of storage tanks and a preparation method thereof. Background technique [0002] Through long-term development, the gas phase corrosion inhibitors commonly used in my country's industry mainly include: imidazoles, azoles, diisopropyl, cyclohexylamines, imidazolines, ammonium benzoate, urotropine, morpholine benzoate, etc. . Zhang Daquan and others used weight loss method, storage experiment, electrochemical experiment and other means to evaluate the performance of benzoic acid morpholine salt vapor phase corrosion inhibitor, and concluded that the performance of the gas phase corrosion inhibitor is better than that of dicyclohexylamine nitrite commonly used in the past. , and low toxicity. In the petroleum industry, corrosion inhibitors are mainly used in the natura...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/10C23F11/04
CPCC23F11/10C23F11/04
Inventor 刘晶姝龙媛媛李开源谭晓林杨为刚魏旭李薛
Owner CHINA PETROLEUM & CHEM CORP
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